Liquid formulation for ophtalmic devices
According to a first aspect, the invention relates to an intraocular variable focus implant comprising a non-conducting liquid with a melting temperature above 0° C., a conducting liquid, a liquid interface formed by the non-conducting and conducting liquids, a first electrode in contact with the conducting liquid, a second electrode insulated from the conducting liquid, wherein the liquid interface is movable by electro wetting according to a change in a voltage applied between the first and second electrodes.
1. An accommodative intraocular lens having a variable optical power and containing two immiscible liquids encapsulated in a foldable structure, said intraocular lens comprising:
a non-conducting liquid having a melting temperature above 0° C. and having a liquid state at intraocular temperature;
a conducting liquid;
a liquid interface formed by the non-conducting and conducting liquids;
a first electrode in contact with the conducting liquid; and
a second electrode insulated from the conducting liquid,
wherein the liquid interface is movable by electrowetting according to a change in a voltage applied between the first and second electrodes,
wherein the foldable structure is filled with the conducting liquid and the non-conducting liquid at a temperature above the melting temperature of the non-conducting liquid,
wherein the intraocular lens is configured to be cooled until the non-conducting liquid is solidified,
wherein the intraocular lens is configured to be folded at a temperature below the melting temperature of the non-conducting liquid,
wherein the intraocular lens is configured to be injected in a folded configuration through a reduced corneal incision,
wherein the intraocular lens is configured to be within a patient's eye, in which the solidified non-conducting liquid melts and the intraocular lens unfolds and becomes operational.
2. The accommodative intraocular lens of claim 1 , wherein the non-conducting liquid comprises a mixture of compounds wherein at least one of the compounds has a melting temperature above an intraocular temperature.
3. The accommodative intraocular lens of claim 2 , wherein one of the compounds in the non-conducting liquid acts as a membrane between the non-conducting and conducting liquids below the intraocular temperature and above 0° C.
4. The accommodative intraocular lens of claim 2 , wherein more than 80% by weight of the compounds have a melting temperature between 10° C. and 37° C.
5. The accommodative intraocular lens of claim 2 , wherein the non-conducting liquid contains less than 20% by weight of organosilanes.
6. The accommodative intraocular lens of claim 1 , wherein the non-conducting liquid comprises one or more compounds selected from the group consisting of a linear alkane [C n H 2n+2 ] where n is greater than 15 and less than 22, a diphenyl alkane [C n H 2n —(C 6 H 5 ) 2 ] where n is greater than 1 and less than 5, vinyl triphenylsilane, diphenylsulfide, palmitic acid, 1,4,-di-ter-butylbenzene, 1-methylfluoene, 9,10-dihydroanthracene, fluorene, methyltriphenylsilane, allyltriphenylsilane, ethyltriphenylsilane, and a cycloalkane C n H 2n where n is greater than 6 and less than 15.
7. The accommodative intraocular lens of claim 1 , wherein the non-conducting liquid comprises less than 20% by weight of phenyltrimethyl germane, diphenyldimethylgermane, or a mixture thereof.
8. The accommodative intraocular lens of claim 1 , wherein the non-conducting liquid comprises one or more compounds selected from the group consisting of a linear alkane [C n H 2n+2 ] where n is greater than 15 and less than 22, diphenylmethane, and a cycloalkane C n H 2n where n is greater than 6 and less than 15.